I've found brew so painful that I switched to nix. Nix unfortunately is painful in its own way. However, I recently discovered devbox which is a wrapper around nix. It works really well as a package manager. Just run "devbox global add <package>"
I already have a Brewfile in my dotfiles stored in git, but wanted a way to setup all the little things on my Mac like trackpad settings, dock settings, file associations, etc. nix-darwin is the obvious solution.
Gave the task to ChatGPT and it came back saying it's a good way to get started, but then offered a middle-ground of an idempotent script to set things up. So I investigated the latter, and after a couple of minutes I now have a setupmac() function in my .bash_profile (yeah I use bash) which mostly consists of a bunch of 'defaults' commands and a few other things, and now continue with brew for managing software and setupmac() to setup everything else, and of course manually manage my dotfiles for ghostty/nvim.
I wish I had this earlier, because I just set myself up on 3 different Macs in the last week or so. I'm also glad I don't need to learn a new language and tooling for something pretty simple. Everything is a bit disjointed and not as automated as a proper nix setup and doesn't have that fidelity that nix has, but it's straight-forward, compact in that it sits in my brain easily, and easy to execute.